Alength is measured as 21 cm correct to 2 significant figures
a) what is the lower bound for the length?
b) what is the upper bound for the length?

1) in triangle the, what is the measure of angle t (in degrees)? 2) in triangle bat, the measure of angle b is 66∘, and the measure of angle t is 77∘.what is the measure of the exterior angle at a (in degrees)?